Plate Tectonics

2. a sudden and violent shaking of the ground sometimes causing great destruction
6. a long elongated depression with steep walls formed by the downward displacement of a block of the earth's surface between nearly faults or fault systems
8. thick part of the earth's crust that forms the large land masses
11. thin part of the earth's crust that underlines the ocean basins
12. continental transform fault that extends roughly 1300 km through California. It forms the tectonic boundary between the pacific-plate and the north american plate, and its motion is right-lateral strike slip
14. an elevated region with a central valley on an ocean floor at the boundary between two diverging tectonic plates when new crust forms from upwelling magma
15. Fracture in a volume of rock, across which there has been significant displacement as a result of rock mass movement
17. Theory that the outer rigid layer of the earth (lithosphere) is divided into a couple of dozen "plates" that move around across the earth's surface relative to each other
19. a mountain or hill, having a crater or vent through which lava and gas are being erupted from the earth's crust
20. two or more tectonic plates move away from each other

1. layer of hot rock material that is located beneath the crust
3. an area in the basin of the pacific ocean whee a large number of earthquakes and volcanic eruptions occur
4. sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
5. mid-ocean ridge, a divergent tectonic plate or constructive plate boundary located along the floor of the atlantic ocean and part of the longest mountain range in the world
7. two or more tectonic plates move towards each other
9. a long, narrow ditch
10. a line of mountains connected by high ground
13. places where plates slide sideways past each other
16. layer of earth that forms the outer skin
18. Currents current in a fluid that results from convection